Mechanical pencil



Sept. '2' 1924.

4 J. c. WAHL MECHANICAL PENCL Filed dei. 24, 1917 Patented Sept. A2, 1924.

UNITED sT- ATEs PATENT OFFICE.

Jomr

` WARE.

C. WAHL, F CHICAGO, ILLINOIS, p p THE WAHL COMPANY 0F WILMINGTON, DELAWARE, A CORPORATION OF DELA- ASSIGNOR, BY MESNE ASSIGNMENTS, T0

4irrlzcnalvrcnr. PENCIL.'

To all whom t may concern.:

Be it known that I, JOHN C. WAHL, a citizen of the United States, and resident o Chicago, in the county of Cook and State of Illinois, have invented certainnnew and useful Improvements in Mechanical Pencils, of which' the followingv is a speciieat-ion.

My invention is a mechanical pencil, particularly in theclass in which there is a lea of small diameter'ffwhich is propelled through the tip of the pencil by a screw plunger.

The object of my invention is to provide an improved lead for pencils 'of this class'.

My invention Will be best understood by reference to the accompanying figures, of which l A Fig. 1 is a longitudinal` section of the pencil;

Fig. 2 is afvieW partly in section of the magazine for the leads, the plunger and means for actuating the same;

Fig. 3 is a perspective'view of the magazine and plunger actuating means;

Fig. 4 is a section along the -line 4-4 of Fig. 1;

Fig. 5 is a section along the line 5 5 of i Fig. 1;

Fig. 6 1s a perspective view' of the lead; Fig. 7 is a section of the same; vFig. 8 is a section along the line 8-8 of Fig". 1*; v

igure 8a. is a section along the line 8*--8a of Figure 1, and

Fig. 9-is a section of Jform of the lead.

My improved pencil consists of. an outer ycasing`10, which 1s provided with a tapered point .11, soldered in which is a guide 12 consisting of a tube 13 .having a funnel 14 a modiscaion in the at one end and a' threaded portion 15 at the other. Into the threaded portion 15 is screwed a tip 16 having a hole slightly larger than the'diamete-r of the body of the lead 17 The lead is made in a section shown4 in Fi 7, and `is provided with a plurality of ri 'The dlameter of the circle circumscribing the outside of-'the ridges 19 'is somewhat larger than the diameter of the hole in the tip-16. Saidtip is made of hardened steel,

or other suitable material, and as the lead 17 ges 19 extending the length thereof.`

is forced through said tip the ridges 19 will be sheared from the body of the lead, theref by insuring that the lead 17 lits tightly in the hole in the tip 16. This is for the purpose of preventin the lead 17 from dropping through the tip 16 and also4 for the purpose of insuring a tight lit. The diameter of the hole 16 is slightly larger than the d diameter of the body of the lead 17, but

somewhat smaller than the diameter of the circle 'which circumscribes the outside of the ridges 19. i y

I shall now describe the means for propel-ling the lead through the tip 17. While varlous means may be employed, I prefer to use a constructlon shown in the accompanying figures. A. tube 20,` provided with threads 21 at its lower end and with a cylindrical surface 22 at its upper end is inserted in the casing 10.. In this tube` is inserted a magazine 23 and plunger 26, shown clearly in Figs. 2 and 3, reference to which will disclose that the cylindrical -magazine .23 has extending from it a pair of tines 24 and 25, which embrace the threaded plunger 26 and serve to turn the same in the screw threads y '24 and 25.

lThe upper portion of the magazine 23 is provided with a contracted portion 30, to whichl is soldered a threaded collar 31, on which is screwed the cap 32. Obviously turning the cap 32 will'turn the magazine 23 and tines 24 and 25. The plunger 26 will be moved relatively to the threads 21 and the pusher 27 consequently will advance the lead 17 as the same'may be used.

' The magazine 23 serves as a receptacle for extra leads (Fig. 4)- and to insert these leads into the pencil it is Ionly necessary to unscrew the magazine 23 until 'the plunger 26 has become disengaged fromthe threads 21 `and Withdraw the magazine from the casing which are sheared from the lead -1i7 y the tip 16 will of course fall down the tube 13' 'into the interior of the pencil and may be not a matter of importance, since the es-` sential feature of my invention is that of providing alea d having a body portion and an outer portion Capable of being sheared when ,thekbody portion lis forced through a ti or suitable shearing means. j

any changes and modifications may be made in my herein' described invention Without ydeparting from'the spirit thereof, since `I claim: i 1.In a mechanical pencil having means .'to .force a lead through a tip, the combination of a lead provided with va body portion and extending portions adapted to be sheared from said body portion and means to shear said extended portionsV from the body of the lead as the same is forced longitudinally through the tip, the tip and'lea'd being held against rotation relative to each other. v j 2. In a mechanical vpenciL/thecombination'of av lead-consisting of a body portion and having extended portions adapted to'be sheared therefrom, a lead propelling means and a tip provided'with means to shear said extendedportions as saidV lead is forced longitudinally through said tip, the tip and each other.

8. In a mechanical pencil, the combina` -cause the remaining portions of the ridges tion of a lead consisting of a body por- 4tion having spaced fins projecting outwardly from the-normal surface of the body ofy the lead, a holder for said lead, and instrumentalities for effectingthe feeding of the .incident 'to said feeding,

lead and a cutting away of the tins, as an substantially as described.y 1

` 4. In a mechanical pencil, a tip, a lead end of the tip for, engaging 4and shearing l the ribs from the lead during the propelling movement thereof.l

'5. In a mechanical pencil, a tip having a central bore, a lead havinga body of substantially the diameter of thertip, ribs eX- t'ending from the body'of the lead, means for propelling the lead longitudinally of the tip, und means 4at the inner end of tlie tip engaging and shearing the ribs from the body1 of the lead during the propelling movement theigeof;

6. In a nicchanical'pencil, a leadhaving ribs extending the length thereof, aguide for the lead, said guide being of a diameter. to receive the lead with the ribs thereon, a 'tip having a bore ofless diameter'than the guide, means for Apropelling the lead longitudinally of the guide and tip, rand means at the inner en-d of the tip engaging and shearing the ribs from the lead during vthe propelling movement thereof.

7. In a mechanicalpenoil the combination of a body and tip, the body being adapted to contain a lead and the tipbeing .formed to permit projection of the lead ing longitudinally extending ridges, and lead being held against rotation relative to' to snuglj7 fit the tip opening.

ln Witness whereof I have .hereuntov sub-' scribed my name.

JOHN o. WAHL. 

